This article analyzes Java serialization and deserialization operations. Share it for your reference, as follows:
Overview:
Java serialization refers to the process of converting Java objects into byte sequences; Java deserialization refers to the process of restoring the byte sequences into Java objects.
Sample code:
import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.Serializable;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;public class Test { /** * @param args */ public static void main(String[] args) { try { ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("D:/objectFile.obj")); Customer customer = new Customer("Chinese",23); out.writeObject("Hello!"); out.writeObject(new Date()); out.writeObject(customer); out.writeInt(123); List list = new ArrayList(); int i =0 ; while(i<100) { Customer customer2 = new Customer("Chinese",i); list.add(customer2); i++; } HashMap hashMap = new HashMap(); hashMap.put("customer", list); out.writeObject(hashMap); out.close(); ObjectInputStream in = new ObjectInputStream(new FileInputStream("D:/objectFile.obj")); System.out.println("obj1= " + (String) in.readObject()); System.out.println("obj2= " + (Date) in.readObject()); Customer obj3 = (Customer) in.readObject(); System.out.println("obj3= " + obj3); int obj4 = in.readInt(); System.out.println("obj4= " + obj4); Object obj5 = in.readObject(); System.out.println(obj5); HashMap hash_map = (HashMap)obj5; List l = (List) hash_map.get("customer"); System.out.println("size: " + l.size()); for(int ii=0; ii<l.size() -1 ; ii++) { Customer c = (Customer)l.get(ii); System.out.println(c.getName()); System.out.println(c.getAge()); } in.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } }}class Customer implements Serializable { private static final long serialVersionUID = 1L; private String name; private int age; public String getName() { return name; } public int getAge() { return age; } public Customer(String name, int age) { this.name = name; this.age = age; } public String toString() { return "name=" + name + ", age=" + age; }}I hope this article will be helpful to everyone's Java programming.